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Re: 1999 Audi a4 climate control replacement
Nope - once you have the trim panel off and can unbolt the CC head unit, just slide it out, unplug the connectors, plug in the new unit, and reassemble. Nothing more to it than that - no diagnostics, codes, or setup needed.
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It sounds like one of 2 things happened: 1. You blew a fuse, be sure to check the fuse panel 2. You knocked the power block to the climate control system loose. Check that the power block leading to the climate controll is tight into the control unit
463A definitely not VAG codes they are from one of the cheap code readers. Audi A4 Quattro - fault code 463a: engine control unit disabled. This could be a dirty sensor or bad connection somewhere. The immobilizer light flashes when you insert the key? Imobiliser pick up loop in the steering column sounds dodgy, take the cowling off & check its connected ok. Just clipped it back in.
You have to remove the trim panel around the stereo/climate control to expose the screws that hold it in place. Once you do that, and the screws are removed, it pulls straight out and unplugs. No need to disconnect the battery and no tricks to it once it slides out.